Fastening device



Oct. 12, 1948. R. A. HARTMAN 2,451,438

ms'rmuma' DEVICE Filed Nov. 13, 1944 Fg." y

ff im@ INVENTOR. fie/Men AJIARMAN "1; Fig. 3 is an end Patented Oer. 12, 1948 Richard A.

to 'rinnerman a corporation of Ohio Application November 18,

8 claims. (0l. 28d-9p) This invention relates to fastening devices for clamping sleeves to members which-they surround. Itis especially well adapted for clamping the ends of yielding sleeves which surround rods or pipes. -An illustration of the use of such a sleeve is a flexible coupling between two conduits or a dust proof covering for a universal Joint. In such cases the yielding sleeve frequently has an outwardly bowed central region terminating on opposite sides in cylindrical ilanges snugly erm bracing the rods or pipes. My invention provides fastening means in the form of partially annular resilient rings which snugly embrace such flanges to hold them tightly on the surrounded rods or pipes, and also coact with such rods or pipes to hold the fastening device in place.

An object of thel invention is to provide such a ring fastener in a form which may be readily applied over the end flanges of the sleeve and by its own resiliency hold the flange tightly clamped on the sur-rounded member. Another object is to so form the fastening member lthat when the fastening device is in plac'e it is automatically interlocked to the member in a manner to prevent longitudinal shifting thereon. Another object is to provide the fastening device in the form which will protect the, end of the yielding sleeve from. injury or wear. These and other features of the invention will be more apdetailed description of the preferred embodiment illustrated in the drawings.

Fig. i is a side elevation of a pair of aligned :conduits connected by a yieldingcoupling sleeve, the edges of rwhich are clamped by my fastening devices; Fig. 2 is a longitudinal diametric section through My fastening device Il comprises a single strip of resilient sheet material, preferably spring steel or alloy, bent into a nearly complete cylindrical form and having one edge thereof periodically notched and flanged inwardly to provide a row device and the surrounding sleeve.

35 theconstruction of Fig. elevation of this embodimenty v Fig. 4 is a side elevation partly in section of a pair of aligned [I Hartman. Cleveland. Ohio, aieignor MIIB, lll.. Qlvblindv, 0h10.

1944, Serial No. 563,287

of arcuately aligned tongues. The tongues are designated 2i in Figs. 3 and 5 and the notches 22. These notches are substantially radial when the strip is in its nnal position. They are preferably of such width that the corners of adiacent tongues substantially contact with each other to flange. y exaggerated in Fig. 5 for clearness of illustration. One end of the body of the strip is preferably notched as shown at 23, the other has a complementarily formed tongue 24, which is adapted to extend to varying degrees into the notch 2l. This allows a certain leeway in the approach of the ends of the strip toward each other rwhile enabling the embraced flange of the .sleeve to besubstantially covered.l

Each pipe lo is` provided near its end with an external groove il, this groove preferably having a bottom surface inclining inwardly in a direction away from the end of the pipe and having its my fastening is applied, the inner edge of its notched flange seats in this groove and abuts the wall thereof normal to the axis.

It results from the construction described, that the yielding sleeve is effectively clamped snugly about the member in place and at the same time the fastening device is automatically locked against shifting longitudinally away from the My fastening device may also operate to force the yieldlngfiange into the groove i5 and thus increase the effectiveness of its attachment to the member embraced. This seating of the yielding sleeve in the groove, as indicatedin Fig. 2. is most readily made by providing a slight inward bead or turned-in end on the yielding flange when it is constructed, then the clamping of .the fastening device forces such bead or inturned end into the groove.

In the universal 4s the same character of sleeve il on a pair of universal joint rods Ilia. These rods may be tubular butvat their inner ends each is formed into or carries a fork II which are pivotally connected at four regions 90 apart to a connecting member o0 l1 as usual in universal joints.

joint construction of Fig. 4, the same clamping devices are shown as clamping .groove about it, said flange is thus protected from wear-Hor injury in its most vulnerable region.

, My fastening device may readily be constructed from a single straight strip oi fiat resilient spring steel or alloy having `a width equal to the longitudinal width of thev body plus the radial width Y of the notched iiange. The notches formed along one edge extend to al depth corresponding to such radial width. The notches as formed inV the flat strip may conveniently be parallel-sided and they are of such width that when the fastener is curved into its cylindrical form the corners of the -tongues provided are substantially in contact with each other: The end portions of the blank are formedwith the end tongue' and end notch shown. After such stamping or cutting operation -iay be bent overa at ange and the strip the notched side portion right angles to form the then given the cylindrical 'form of Fig. 5.

The device normally tends to form a complete ring with the end tongue notch. Fig. 5 showing the spread form. In applying it, sothat the inner periphery of the flange rests on the ungrooved portion of the pipe or rod and then on being shoved longitudinally the bodyof device in a slightly the fastener passes over'the flange of the sleeve andthen 'the fastener springs into piace with its iange occupying the groove and abutting the outer wall thereof as shown. l 7

= I claim: v

1.."Ihecombination with a sleeve and a meinber which it embraces having a shoulder adjacent the end of said sleeve oi a fastening device coniprising a partial ring of resilient material embracing the sleeve and flange extending inwardly across the end of the sleeve and' having its outer face engaging the shoulder on said member.

2. The combinations groove being formed withoccupying the end it is spread slightly by its yown `r `asilience-, clamping it on the member and having an edge ofamemberhavinga.v

inclined bottom leading inwardly away fromthe end of theA member and an .end wall in a plane normal to the axis of the member, asleeve embracing the member and vseated in said groove.

5 and a fastening device comprising a partial ring of `resilient material embracing the end of'said y sleeve. said fastening device havinga periodically notchededge langeextending in the same groove and engaging said end wail.'

10 3. The combination ofa member havinga an open notch receiving said tongue. v

' i 'RICHARD A. HARTMAN.

REFERENCES CITED The following references areof record in the file of this patent:

UNITED STATES APATENTS Number Name Date ,576,119 Feb. 2,1897 721,577y Lindner Feb. 24, 1903 809,903 Bowers Jan. 9, 1906 40 1,497,540 conrad: June 10, '1024. 1,748,702 meer Feb. 25, 1930 Stillwagon July 2l, 1942 

